64 I/O Expander Shield for max 1024 I/O

ShapeShifter:
Good catch! That's the way it should be.

A good tip at this point is to use the "Show" command to highlight critical traces on the board, and see if they look reasonable without a lot of unnecessary rambling. On this board, I think that would include power, ground, and SCL/SDA.

Yes, this is what I'll do this afternoon before send for build! :slight_smile: